/ Dictionary / Index Q quadriad: Meaning and Definition of Find definitions for: quad•ri•ad Pronunciation: (kwod'rē-ad"), [key] — n. a group of four, esp. a group of four persons with an interest or task in common. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quadri- quadric Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language